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2121020210 = 25232400949
BaseRepresentation
bin111111001101100…
…0011001100110010
312110211001222202002
41332123003030302
513320440121320
6550244454002
7103363242251
oct17633031462
95424058662
102121020210
11999295971
124b23aa302
1327a56a75a
1416199c798
15c631a675
hex7e6c3332

2121020210 has 24 divisors (see below), whose sum is σ = 3991056300. Its totient is φ = 811518752.

The previous prime is 2121020201. The next prime is 2121020219. The reversal of 2121020210 is 120201212.

Adding to 2121020210 its reverse (120201212), we get a palindrome (2241221422).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2121020201) and next prime (2121020219).

It can be written as a sum of positive squares in 2 ways, for example, as 1903664161 + 217356049 = 43631^2 + 14743^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121020191 and 2121020200.

It is not an unprimeable number, because it can be changed into a prime (2121020219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195185 + ... + 205764.

Almost surely, 22121020210 is an apocalyptic number.

2121020210 is a deficient number, since it is larger than the sum of its proper divisors (1870036090).

2121020210 is a wasteful number, since it uses less digits than its factorization.

2121020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401002 (or 400979 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2121020210 is about 46054.5351729881. The cubic root of 2121020210 is about 1284.8376929148.

The spelling of 2121020210 in words is "two billion, one hundred twenty-one million, twenty thousand, two hundred ten".

Divisors: 1 2 5 10 23 46 115 230 529 1058 2645 5290 400949 801898 2004745 4009490 9221827 18443654 46109135 92218270 212102021 424204042 1060510105 2121020210